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System and method for maintaining cache consistency in a wireless communication system

  • US 7,136,968 B2
  • Filed: 04/25/2003
  • Issued: 11/14/2006
  • Est. Priority Date: 04/27/2002
  • Status: Expired due to Fees
First Claim
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1. A method for maintaining cache consistency of a mobile communication terminal in communication with a communication server in a wireless communication network, the method comprising:

  • broadcasting an invalidation bit pattern (IBP) from the communication server to the mobile communication terminal, the IBP comprising a plurality of bits, at least one bit representing whether or not a corresponding cached data for a mobile communication transaction is invalidated after a first broadcast period, wherein the mobile communication terminal receives the IBP whether or not a disconnection in communication between the mobile communication terminal and the communication server occurs;

    determining whether or not the disconnection in communication between the mobile communication terminal and the communication server occurred based on a time stamp of the IBP;

    updating invalidated cached data based on updated information included in the IBP, if it is determined that the disconnection did not occur; and

    updating a first portion of the cached data based on updated information included in the IBP, if it is determined that the disconnection did occur;

    wherein the mobile communication terminal comprises a cache for caching transaction data, wherein an IBP comprises a time stamp t1, and wherein t2 represents time when a last IBP was received by the mobile communication terminal, the method further comprising replacing a first portion of the cached data by a most recent transaction data provided by the communication server, if the difference between t1 and t2 is greater than a threshold value.

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